Brake drum



7 March 6, 1928. I 1,661,218

J. FEJES BRAKE DRUM Original Filed May 28. 1926 2 Sheets-Sheet 1 M/VENTDR March 6, 1928. 1,661,218

J. FEJES BRAKE DRUM Original Filed May 28, 1926 g sh s 2 Patented Mari 6, 1928.

' gownsstares 1,661,218 PI -TE NIT OF ICE- QY I DAPES eme B AKE 19min.

Original applicatio filed ma 2a; 1926, Serial No..112,343.' Divided menus application aim December so,

-- T I 192s. sermfno. 158,067,

' This invention relatesto an improved construction of brake drums for motor and like vehicles. v Y

Brake drums are known to which a disc of 5 sheet metal is welded to a cylindrical portion of cast metal,

" The main object of the invention is so to construct and mount the brakes and parts associated therewith that their dynamic l forces a1'1din consequence thereofalso the vibrations which are 'usuallytransmitted by the said-dynamic forces to the main springs, chassis frame, etc., are substantially reduced. Thismain object is attained bymaking not 5. only the disc-like portion but also the 'cyli dricalportionof t-heibrake drum ofstrips of sheet iron welded togetheras hereinafter more particularly described. By thus constructing the brake drum; its weight and consequently its forces of inertia are greatly drum is much heavier as has been the case with the constructions hithertoemployed. The construction: according to the present invention has the'further advantage thatthe 7 heat is rapidly radiated and overheatingentirely prevented. A stillv further advantage consists in the great reduction ingthecost'of 30, manufacture which is due not only to the tra provision has to be made for cooling the brakes in order to prevent overheating.

It is also to be pointed out that owing to the masses of the movable parts beingmuch lighter than the masses of thebrakes hitherto employed the efliciency of the improved brake is correspondingly increased.

Referring to the accompanying drawings which illustrate the invention by Way of e xample, v v 1 1 I s Figure 1 is a part sectionalfplan of the 50, improved construction and mounting of brake and parts associated therewith as applied to therear axle of a motor vehicle,

Figure2 is a section along the line 11 in Fig.1, 1 i

reduced as compared with the forces of in' ertia which are produced when the brake I Figure"3 is "a sectionalelevation of one of 65 the brake shoes, I Figures 4 and 5 are transverse sections along the lines 22, and33 in Figure 3112- spectively, Figureo is a perspective view of a portion of the brake drum, whilst i Figure 7 is a detail illustrating a modifica-v tion of the joint of the cylindrical part of the brake drum.

' is a portion of one half ofthe driving axle and Z) ap0rt1'0n of the tubular outer casingthereof; 0 15 a wrought iron boss on which the parts hereinafter more'particularly 'referred to. are mounted and which after the said; parts have been attached thereto is slid onto the tubularoutercasing b and'is spot welded to the said casing, for instance at 0 and 0 (Z S one, of the main late springs vhich is. fitted ontothe boss 0 ythe usual" means of connection, 6 being fixing bolts.

7 ,17, are two operating spindles intended to he connected in the usual way through the intermediary of operat ng levers and "connecti'ng rods (notshown) respectively to a hand level-and pedal provided at the front of the vehicle. 5The1operationspindles-i f are respectively 'mount'ed'intubes 9 g, which are carried by two sheet metal 'supn ports h and z' to which they are ,welded as shown at h and z' The sheet metal support h is flanged as shown at 16 ,12 and h whilst the sheet metal support [is constructed in the formof a hollow box,- being constituted Of two'annular metalsheets i, i and a peripheral sheet metal band'z' ,'thetw0 metal sheets i i be ng flanged as'indicated at i i and a; and the peripheral band '6 being edge welded thereto as indicated at 65.. The boss 0 is providedwith annular flanges '0 and 0 to which the supporting sheet metal plates h and z'areedgc welded as shown at in and a, respectively.

I A and B are the two brakes, each comprising a pair of shoes, such as shown at A and- A in Figure 2. The pair of shoes of the brake Aare mounted on the spindles f vf in such a manner as to surround atone side i the cylindrical portion j of the spindle and abut at the other side against flat surfaces providedon a camportion 70 formed on the. spindle f whilst the shoes'of the brakeBare mounted insuch amanner as to ,abut atone side against the'fiat surfaces of sin a cam portion formed on the'spindle f and at the other side surround a cylindrical portion j of the spindle f The two pairs of brakes are held in their normal inoperative position by means of springs 1,2, 3, i and their. operation is effected in the usual way by the rotation of the cam portions Is 70 when the spindles f f are operated by the brake lever and pedal. F and F, are two disc-shapedportions of the spindles f j, which separate the cam portion is, or 70 from the cylindrical portion 7', or 3' The actual construction of the brake shoes isshown in Figures 2-5. Each brake shoe consists of two flanged SlClQ SlLIlPS Z, of

. sheet metal and an outer peripheral strip nalso of sheetmetal which is edge welded onto theflanges Z m of the side stripsas shown at Z and m respectively. The shoe is'reinforced by inner strips of sheet metal 0 0 ,-0 which are edge welded onto the fianges'l m of the side strips as shown for instance at Z m in connection with the strip 0 The one end of the brake shoe is ceive the ends of the springs 1, 2, 8, i for which purpose they are provided with eyes 1' 8 t is the usual strip of Ferodo which is suitably secured to the strip n.

The brake drum is also made ofv sheet metal and it vcomprlses in addition to the cylindrical brake portionu a disc-like portion M by which it is secured in theusual manner, such as by bolts o, to the wheel U of the vehicle, which is mounted on an extension 0 of the boss 0 in the usual way through the intermediary of ball bearings U The two portions M and a, of the brake drum are dove-tailed into one another as shown at 10,, being edge-welded all along the r adjoining edges of the dove-tail connections.

The cylindrical portion u, of the drum is made of a piece ofsheet iron having the required width and length, its two ends being dove-tailed as shown at M and u and buttwelded all along the edge of the dove-tail connection.

ribs u which may beobtainedby milling. Instead of onewdove-taih'a plurality of such connections may be provided along the connecting ends of the 'strip' of sheet metal used for the cylindricalportion u for instance i 65 I wish it to be understood'that'the inven- I tion is not limited to the details hereinbesuch as shown in Figure 7'.

.iore given by way of example as the same may bemodified in various respects without in any way departing from thespirit of the invention. Further, the invention s not to the rear axle 01 a vehicle-as it; is equally applicable to thefront axle thereof, in connection with which a brake accordingto the invention may be employed with special 'ad- In this way the resistance of f the drum tothe stresses to which itis. subjected .is substantially(increased. Further,

the portion u, of the drum is. formed with limited tothe application of the" invention I Vantage as it greatly reduces thetende y of producing gyroscopic efi'ects ticularly when steering. What I claim is more par- 1. A brake drum for wheels of motor and other vehicles comprising a cylindrical portion (u and a disc-like portion (a bothportions being made of sheet-iron andedgewelded --together and the said cylindrical portion (14,) of sheetiron being made of a strip having dove-tailed ends'butt-welded H along the edges, as set forth.

2; A brake drum for wheels ofmotorand 1 other vehicles comprising a cylindrical portion (a )v anda disc-like portion (a the two portions being made of sheet iron and clove-tailed into one another and beingedge' welded together along their dove-tailed conmotion, as set. forth.

In testimony whereof I have signed my name to this specification. t

1 J ENO V'FEJES; 

